Spread spectrum encoding and decoding

Abstract

Certain aspects of the present disclosure relate to a method for generating spread-spectrum coded signals for transmission in a wireless communication system, and for efficient despreading at a receiver.

1 . A method for communication, comprising:
 generating at least one generalized Golay code from a concatenation of a plurality of constituent Golay codes; and   spreading at least a portion of a data stream with the at least one generalized Golay code.   
     
     
         2 . The method of  claim 1 , wherein the generalized Golay code has a length N expressed by N=Σ k=1   K 2 M     k    where K is the number of constituent Golay codes, and K≧2, and where a k th  constituent Golay code has length 2 M     k   . 
     
     
         3 . The method of  claim 1 , wherein the number of constituent Golay codes is two. 
     
     
         4 . The method of  claim 1 , wherein the constituent Golay codes comprise at least one of Golay codes of a plurality of types, Golay codes constructed from a plurality of seed vectors, and Golay codes constructed from a plurality of delay vectors. 
     
     
         5 . The method of  claim 1 , wherein the portion of the data stream comprises at least one of said payload, header, and at least one field of a preamble. 
     
     
         6 . A method for communication, comprising:
 receiving a spread data stream; and   despreading at least a portion of the spread data stream using a generalized Golay correlator.   
     
     
         7 . The method in  claim 6 , wherein the generalized Golay correlator comprises a plurality of efficient Golay correlators. 
     
     
         8 . The method in  claim 6 , wherein the generalized Golay correlator is a serial generalized Golay correlator. 
     
     
         9 . The method in  claim 6 , wherein the generalized Golay correlator is a parallel generalized Golay correlator. 
     
     
         10 . The method in  claim 6 , wherein the portion of the data stream comprises at least one of said payload, header, and one or more fields of a preamble. 
     
     
         11 . An apparatus for communications, comprising:
 a generator for generating at least one generalized Golay code from a concatenation of a plurality of constituent Golay codes; and   a spreader for spreading at least a portion of a data stream with the at least one generalized Golay code.   
     
     
         12 . The apparatus of  claim 11 , wherein the generalized Golay code has a length N expressed by N=Σ k=1   K 2 M     k    where K is the number of constituent Golay codes, and K≧2, and where a k th  constituent Golay code has length 2 M     k   . 
     
     
         13 . The apparatus of  claim 11 , wherein the number of constituent Golay codes is two. 
     
     
         14 . The apparatus of  claim 11 , wherein the constituent Golay codes comprise at least one of Golay codes of a plurality of types, Golay codes constructed from a plurality of seed vectors, and Golay codes constructed from a plurality of delay vectors. 
     
     
         15 . The apparatus of  claim 11 , wherein the portion of the data stream comprises at least one of said payload, header, and at least one field of a preamble. 
     
     
         16 . An apparatus for communication, comprising:
 a receiver for receiving a spread data stream; and   a despreader comprising a generalized Golay correlator for despreading at least a portion of the spread data stream.   
     
     
         17 . The apparatus in  claim 16 , wherein the generalized Golay correlator comprises a plurality of efficient Golay correlators. 
     
     
         18 . The apparatus in  claim 16 , wherein the generalized Golay correlator is a serial generalized Golay correlator. 
     
     
         19 . The apparatus in  claim 16 , wherein the generalized Golay correlator is a parallel generalized Golay correlator. 
     
     
         20 . The apparatus in  claim 16 , wherein the portion of the data stream comprises at least one of said payload, header, and one or more fields of a preamble.